package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @author ACE-Felix
 */
@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        // 判断当前加入购物车中的商品是否在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        // 如果存在，则数量加1
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            // update shopping_cart set number = ? where id = ?
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else{
            // 如果不存在，则添加到购物车，数量默认为1
            // 判断本次添加到购物车的是菜品还是套餐
            if (shoppingCartDTO.getDishId() != null) {
                // 本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(shoppingCartDTO.getDishId());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                // 本次添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
            log.info("添加购物车成功");
            log.info("购物车数据：{}", shoppingCart);
        }
    }

    /**
     * 获取当前用户的购物车数据
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        Long userId = BaseContext.getCurrentId();
        List<ShoppingCart> list = shoppingCartMapper.list(ShoppingCart.builder().userId(userId).build());
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByIds(userId);
    }
}
